/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.fn.harness;



/** An interface that groups inputs to an accumulator and flushes the output. */

public interface GroupingTable<K, InputT, AccumT> {



  /** Abstract interface of things that accept inputs one at a time via process(). */

  interface Receiver {

    /** Processes the element. */

    void process(Object outputElem) throws Exception;

  }



  /** Adds a pair to this table, possibly flushing some entries to output if the table is full. */

  void put(Object pair, Receiver receiver) throws Exception;



  /** Flushes all entries in this table to output. */

  void flush(Receiver output) throws Exception;

}